Similar to Iceberg Lake, Upper Grinnell Lake has ice floating around
on it all year. This is due to the melting of the Grinnell Glacier. During
the summer months, bits and pieces of the ice break off. Some of these
pieces of ice can also be very sizable. The ice frequently takes weeks
to fully melt, as the waters of Upper Grinnell Lake are exceptionally
cold (just above freezing). The mountains in the background are part
of the Continental Divide.
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